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Mitsubishi Electric MSC-GA35VB- E1 User Manual

Mitsubishi Electric MSC-GA35VB- E1
24 pages
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING······································11
10. DISASSEMBLY INSTRUCTIONS·····················18
11. PARTS LIST······················································20
12. OPTIONAL PARTS···········································22
Wireless type
Models
MSC-GA20VB -
(WH)
MSC-GA25VB -
(WH)
MSC-GA35VB -
(WH)
E1
E1
E1
MSC-GA20VB -
MSC-GA25VB -
MSC-GA35VB -
E1
E1
E1
No. OB385
SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Indication of model name
NOTE:
•This manual describes technical data of indoor units.
•As for outdoor units MU-GA20/GA25/GA35VB - , refer to the service manual OB386.
•As for outdoor units MUH-GA20/GA25/GA35VB - , refer to the service manual OB387.
•As for outdoor units MUX-2A28/2A59/3A60/3A63/2A70/4A73VB - , refer to the service manual
OB384.
•As for outdoor units MXZ-A14/A18/A26/A32WV - , refer to the service manual OB319 REVISED
EDITION-A.
E1
E1
E1
E1
OB385-1.qxp 05.1.25 18:50 Page 1
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Mitsubishi Electric MSC-GA35VB- E1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMSC-GA35VB- E1
CategoryAir Conditioner
LanguageEnglish

Summary

Technical Changes

Part Names and Functions

Unit Specifications

Noise Criteria Curves

Unit Outlines and Dimensions

Indoor Unit Wiring Diagram

Indoor Unit Refrigerant System Diagram

Service Functions

Timer Short Mode Service

Shortens timer settings for service by short-circuiting JPG and JPS.

PC Board Modification for Individual Operation

Modifies remote controller PC boards for individual operation of up to 4 indoor units.

Remote Controller Type Setting

Sets the remote controller type (COOL & HEAT or COOL ONLY) for correct operation.

Operation Mode Switchover and Auto Restart Function

MU/MUX vs MUH/MXZ Type Switchover

Switches indoor units for MU/MUX or MUH/MXZ type outdoor units.

Auto Restart Function Operation

Manages automatic unit restart after power restoration for memorized settings.

Troubleshooting Guide

Troubleshooting Cautions and Procedure

Covers safety precautions, basic checks, and troubleshooting steps for abnormalities.

Remote Controller Battery Replacement

Instructions for replacing batteries in the remote controller to ensure proper function.

Multi-System Air Conditioner Information

Notes on operating multiple indoor units with one outdoor unit, including mode synchronization.

Troubleshooting Flowcharts

Indoor/Outdoor Operation Troubleshooting

Flowchart for diagnosing issues when the indoor unit operates but the outdoor unit does not.

Troubleshooting Check Table

Self Check Table for Abnormalities

Table correlating operation indicator flashes with symptoms, detection, and checkpoints.

Trouble Criterion of Main Parts

Part Resistance and Voltage Checks

Criteria for checking main parts like thermistors, motors, and varistors.

Remote Controller and PC Board Checks

Remote Controller Operation Check

Steps to check if the remote controller functions correctly with the unit.

Indoor Electronic Control PC Board Checks

Visual and functional checks of the indoor electronic control PC board for faults.

Serial Signal Error Troubleshooting

Mis-wiring and Serial Signal Error Check

Procedure to diagnose mis-wiring or serial signal errors affecting outdoor unit operation.

Test Point Diagrams and Voltages

Indoor PC Board Test Points

Diagram showing test points and voltages on the indoor electronic control PC board.

Disassembly Instructions

Removing the Front Panel

Step-by-step guide to safely remove the front panel of the indoor unit.

Removing PC Boards and Holders

Instructions for removing electronic control and power monitor/receiver PC boards.

Component Removal Procedures

Electrical Box Removal

Steps to detach and remove the electrical box assembly.

Nozzle and Vane Motor Removal

Procedures for removing the nozzle assembly and vane motor.

Fan Motor and Heat Exchanger Removal

Steps to remove the indoor fan motor and the line flow fan.

Indoor Unit Structural Parts List

Indoor Unit Components

List of structural parts for the indoor unit with part numbers and quantities.

Accessory and Remote Controller Parts List

Remote Controller Components

List of accessories including remote controller and holder with part numbers.

Indoor Unit Electrical and Functional Parts List

Electrical and Functional Components

List of electrical and functional parts with part numbers and quantities.

Indoor Unit Heat Exchanger Parts List

Heat Exchanger Components

List of parts related to the indoor unit heat exchanger.

Optional Parts Information

Air Cleaning Filter Details

Information on the air cleaning filter, its function, life, and handling.

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